performSelectorOnMainThread Problem

10 Oct 2011

      The xcode documentation states that if the method
performSelectorOnMainThread has the argument withObject:nil, then the nil
means that the target method takes no arguments.

The following code throws an ArgumentError wrong number of arguments (1
for 0):

def foo
    self.performSelectorOnMainThread(:'bar', withObject:nil,
waitUntilDone:true)
end

def bar
    # some gui change
end

But it works fine if I add a dummy argument to the bar method and change
the selector to 'bar:' like

def foo
    self.performSelectorOnMainThread(:'bar:', withObject:nil,
waitUntilDone:true)
end

def bar(dummy)
    # some gui change
end

Is this a bug, or do I really need the dummy argument in the target method?

Thanks,
Alex.

Alex Greif

Daniel Westendorf

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